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IWC Ingenieur Constant-Force Tourbillon
With the spectacular Ingenieur Constant-Force Tourbillon in its platinum and ceramic case, IWC still leads the field in the Constructors’ Championship of Haute Horlogerie. This precision machine’s patented constant-force mechanism is integrated in a tourbillon and ensures that the amplitude of the balance remains almost constant. It guarantees an extremely precise rate over a period of at least 48 hours. The newly developed 94800-calibre basic movement features two barrels that provide the energy for the higher torque required to drive the constant-force tourbillon. It also provides the moon phase module with the necessary power. The double moon display depicts the surface of the earth’s only natural satellite so realistically that even tiny craters can be recognized. The countdown scale shows the number of days remaining until the next full moon. The power reserve display between “4” and “5 o’clock” indicates the energy remaining in the mainspring. The design on the movement side, visible through the transparent sapphire-glass back, was inspired by a sports car’s engine block. Perforations provide a clear view of the intermeshing gears: performance engineering for purists.

For the new Ingenieur Constant-Force Tourbillon, IWC has integrated a patented constant-force mechanism into a tourbillon. It ensures that the amplitude of the balance – and thus the watch’s accuracy – remain absolutely constant, initially by disconnecting the escapement from the direct flow of energy generated by the gear train. The energy is stored temporarily in the balance spring from where it is transferred to the escape wheel. In the process, the balance spring is put under tension once a second and the seconds hand in the tourbillon advances in one-second jumps. This ensures an extremely regular and precise rate over a period of at least 48 hours. After approximately two days, the movement switches from constant-force mode to normal mode, as can be seen from the second hand, which now starts to advance at intervals of one-fifth of a second.
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